Yikes, comic sans is the last font you would ever want to use :)
I actually was trying fonts with node-webkit for the first time today to see if I could work it out, and it it worked perfectly. Was cool to see the font displayed in the layout in C2 as well. After following this tute it worked without a hitch:
Maybe it is the font that you used? Some fonts may be more problematic than others? I just changed my .ttf to a .woff via Font Squirrel using the visitor1 font from Dafont.com:
you could always try this font as test and then go back to your original font.